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Biotic Potential of Three Coccinellid Predators on Various Diaspine Hosts

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Biotic Potential of Three Coccinellid Predators on Various Diaspine Hosts J. Bioi. Control, 3 (1).20 - 23.1989 Biotic Potential of Three Coccinellid Predators on Various Diaspine Hosts S.K. JALALI and S.P. SThlGH Biological Control Centre. National Centre for Integrated Pest M;mage~ent. Bangalore 560024 ABSTRACT Biotic potential of three CocdnelUd predators viz., Chiku:orus hljugus (l\fU,f$.). Chilocorus nigritus (Fab.) and Slicholoth rruulagassa (Weise) were studied on various diasplne scales. C. bijugus and C. nigritus accepted all the hosts provided whereas, S. madagassa accepted only three hosts. When aqueous extract of sugarcane scale Insect was sprayed over non-preferred host, S. mtldagassa could develop on two additional hosts. Developmental period on dUJerent hosts In case of C. bijugus and C. nigritus ranged from 33.5 to 41.4 and 32.3 to 35.1. days respectlvelt, wb~ S. lIUldagassa developed faster on Me1a1UUpu glomerata (Green) (33.4 days) tbanon other bosts.S. madagas$tl. was also found to be more fecund on M. glomerata. C. bijugus showed relative preference for Quadraspidiotus pemiciosus (Comst.), lived longer and produced larger progeny. C. nigritus fed and bred equaUy well on all the hosts provided, sbowlng Its wide acceptability and polyphagous nature. C. nigritus was found to be more promising on biotic parameters followed by C. bljugus and S. madagassa. KEY WORDS: Biotic potential. coccinellid predators. diaspine scales The armoured scale iusects constitute one of Experiments were conducted to determine the the most important groups of pests in agriculture. rate of host consumption by grubs and adults of especially in sub- tropical and tropical regions of the predators by releasing them on known scale in­ the world (Clausen, 1978; Sankaran, 1986). Coc­ sect population of same age group (20-25 days cinellid predators are important biosuppression old). Observations were recorded daily on host in­ agents of diaspine scale insects. No efforts have so sects consumed by grubs. Since adults lived for far been made to study the comparative develop­ ,(35-87 days), host consumption was recorded ment, their host range. fecundity and longevity on every 5, days and mean host consumption was different diaspine scale insects.· Therefore, studies ~ derived. This experiment was replicated 10 times. on biotic potential of two indigenous coccinellids Observations on progeny production and longevity viz., Chilocorus bijugus (Muls.) and C. nigritus on various hosts were also recorded. In this. scale (Fab.) and on one exotic viz., Stich%tis madagas­ insect-infested material was changed every 15 sa (Weise), were conducted and the results are · days after the commencement of egg laying, be­ presented in this paper. cause in preliminary tests it was found that if adults and grubs feed on the same fully infested MATERIALS AND METHODS , pumpkUi fruit till their entire longevity period, the ,pumpkiIl was not able to provide sufficient food Nine species of host insects (Table .l} . were. , ·~(h0~bswerenotable .&COIftl'lete reared on pumpkins except M. glomerata which their development. The experiments were con- was reared on sugarcane setts in the laboratory. · ducted at 27 ± I.8°C 55 + 2.3% RH.. All the predators viz., C. bijugus, C. nigritus and S. madagassa were field-collected and were ini­ RESULTS AND DISCUSSION tially reared in the laboratory on their natural hosts. Developmental period of the predators was The results indicated that egg period lasted 6.0 recorded by releasing one pair of freshly emerged ,to 6.S'days for the three predators (Table 1). The beetles on each of the hosts_ Each treatment was length· of developmental period of the four larval replicated 4 times. Pumpkin fruits/sugarcane setts · instars of 3 species of predators varied significant­ were observed daily for egg laying. Preoviposi­ ly with the host. C. bijugus took less time (21.4 lion. egg, larval and pupal periods were recorded days) on Q. perniciosus than on M. glomerata on each host. (26.6 days); C. nigritus (21.0 days) on M. glomerata than on Lepidosaphes cornutus Green -- Contribution No. 51002 of Biological Control Centre. (23.2 da~s). S. madagassa strongly preferred M. (National centre for Integrated Pest Management), Bangalore glomerata and grubs were able to complete . development in 19.8 days while on Q. perniciosus 21 Biotic potential of coccinellids TABLE L Developmental period of three cocdnelUd predators* OR varloUf dJaspJne hmts Development period (in days) Host Egg Larval Pupal Total 1 2 3 1 2 3 1 2 3 1 2 3 Mean Melanaspis glomerata 6.8 6.1 26.6 5.8 6.6 33.4 35.9 (Green) 6.0 21.0 19.8 8.0 41.4 32.9 Quadraspidiotus 6.0 6.3 6.S 21.4 20.4 22.3 6.1 5.6 7.9 33.S 32.3 36.7 34.2 perniciosus (Comstock) AspidiotllS destructor 6.0 6.2 24.0 20.8 6.4 36.1 33.4 34.7 Signoret 6.1 Au/acaspis tubercularis 6.0 6.0 .26.3 21.8 7.1 6.3 39.4 34.1 36.9 Signoret Hemiberlesia lalaniae 6.1 6.0 6.8 24.7 23.0 24.4 8.0 6.1 7.2 38.8 35.1 38.4 37.4 (Newstead) Aonidiella aurantii 6.8 6.1 6.8 22.0 22.0 24.2 6.3 6.0 7.0 35.1 34.1 37.0 35.4 (Maskell) Chrysomphalus 6.2 6.0 23.4 21.7 7.1 6.S 36.7 34.2 3S.4 aonidum (L) Aonidomytilus albus 6.3 6.1 26.7 22.9 6.S 6.1 39.5 3S.06 37.3 (Cockrill) - Lepidosaphes cornutus 6.4 6.0 6.7 24.4 23.2 23.9 7.6 5.1 6.8 38.4 34.3 37.4 36.8 Green Mean 37.7 34.0 36.6 ... 1. Chi/ocorus bijugus 2. C. nigrrilus 3. Sticho/otis ma44ga3sa (-) indicates host not preferred. Host x Hosts Predators predators C.D. at 5% 0.7 0.4 1.1 in 22.3 and in Lepidosaphes cornutus Green 23.9 in shortest time on aU hosts (34.0 days) was found days. Other hosts were not preferred. When to be a bet1;er predator. Developmental period aqueous extract as described by Quednau and varied significantly with C. bijugus (37.7 days) Hubsch (1964) of sugarcane scale was applied on and S. madagassa (36.6 days). Q. perniciosus, A. non-preferred hosts. mating was stimulated. How­ destructor. A. Qurantii and M. glomerata were ever, egg laying was observed only on H. lataniae . found to be better hosts with regard to the and A. aurantii. L.arval period was found to be developmental period of all the three predators. 24.4 and 24.2 days respectively on these two hosts. Total developmental period of C. bijugus Host (:onsurnption rate by grubs of C. bijll.gus, ranged from 33.5 to 41.4 days. C. nigritus 32.3 to C. nigrifrLf and S. madagassa ranged from 20.3 to 35.1 days and S. 1(Uldagassa 33.4 to 38.4 days. Our 35.5; 29.7 to 38.0 and 11.4 to 14.8 scales per day studies on C. nigritus corraborates with those of fon 20-25 days old scale insects of various hosts, Ahmad (1970), on C. hijugus with Cbamyuvadze respectively. Similarly. host consumption by (1976) and with Seshagiri Rao et al. (1978) on S. adults ranged from 47.4 to 67.0,60.7 to 71.4 and madagassa. But all of them studied the biology on 3.0 to 30.4 respectively (Table 2). C. bijugus a single host. preferred Q. perniciosus and A. aurantii whereas S. madagassa preferred M. glomerata and Q. per­ C. nigritus which completed the development niciosus. C. nigritus did not exhibit strong 22 JALALI AND SINGH TABLE 2. Host consumption by grubs and adults ofthrecpredators* on. various hosts Host consumption (No./day) Host Grubs Adults 1 2 3 Mean 1 2 3 Mean b M. glomerata 28.4 32.0 14.8 25.1 48.3 63.0 30.4 47.2 a Q. perniciosus 355 34.1 13.0 27.5 67.0 71.4 23.0 53.8 c A. destructor 29.6 38.0 9.0 22.5 47.4 68.3 7.0 40.9 c A. tuhercularis 20.3 30.0 0.0 16.S 49.8 61.4 3.0 38.1 a H.lataniae 31.8 33.6 11.4 25.6 58.0 67.6 20.6 48.7 a A. aUTanlii 34.5 31.8 12.0 26.2 61.0 62.3 15.8 46.4 d C.aonidum 30.3 29.7 0.0 20.0 57.0 60.7 8.2 42.0 d A. albus 23.0 31.0 0.0 18.0 52.0 62.4 6.8 40.4 b L. cornutus 32.0 30.0 13.0 25.0 59.0 65.6 22.8 49.1 Mean 295 32.2 12.4 555 64.7 15.3 ... 1. C. bijugus 2. C. nigritus 3. S.madagassa Host x Hosts Predators predators Grubs 2.3 1.3 4.0 C.D. at 5% Adults 3.3 1.9 5.7 preference for any hosts. However, grubs and adults of C. nigritus consumed significantly higher Longevity of C. bijugus ranged from 56 to 87; number of prey insects than C. bijugus and S. C. nigritus 70 to 81 and S. madagassa 15 to 64 on madagassa. Earlier. Raghunath and Rao (1983) different hosts. C. bijugus and C. nigritus lived for reported that C.
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